Physical therapy, occupational therapy and speech therapy billing is complex due to the considerable number of rules, codes, and modifiers. In addition, billing in this area is dependent on specific coverage policies and limitations of payers. There are complex rules related to modifiers, co-treatment by multiple disciplines, and providing multiple procedures on one day, one must know how to bill using the 8-minute rule, services provided by aides and assistants, caps on services, billing by time, and billing for reevaluation.

It is crucial to have complete and comprehensive knowledge of the procedures and codes involved to minimize the chances of reduced or denied reimbursements.